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RF Connectors Complete Catalog Download

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WiFi Interface Identifier<br />

WiFi Interface Identifier<br />

Today’s wireless market has exposed us to many new, and some familiar connectors. The wide<br />

range of antennas, access points, routers, WLAN’s, cellular devices, PCMCIA cards, Bluetooth,<br />

and wireless broadband equipment now available to meet Wi-Fi IEEE802.11a/b/g requirements<br />

can sometimes seem bewildering. What are the input and output connectors used with Wi-Fi<br />

certified products which include: access points, gateways, residential gateways, PC cards,<br />

PCI cards, PCMCIA cards, UB devices, wireless print servers, WLAN enabled computers, PC<br />

peripherals, antennas, LANs and Internet access devices? Many of these connectors are not<br />

easily recognizable. We will try to give you a little background on the common Wi-Fi connectors<br />

and some tips to help you identify them.<br />

In addition to specialized interfaces which are relatively new to the coaxial market, such as<br />

DMX, MC Card, MHF, there are variations on standard <strong>RF</strong> connectors styles which satisfy FCC<br />

Part 15 and 802.11 requirements. The most popular method used to achieve compliance has<br />

been to create reverse polarity, or gender, versions of BNC, MCX, MMCX, N, SMA, SMB, SSMB<br />

and TNC connectors. You will also find reverse, or left-handed thread versions of N, SMA and<br />

TNC connectors.<br />

QMA<br />

QMA connectors are quick disconnecting versions of SMA<br />

connectors; they snap on and off rather than mate by turning<br />

threads. QMA’s couple in two seconds rather than twenty,<br />

but more importantly, they can be rotated 360 degrees after<br />

they are mated, optimizing the flexibility of installations and<br />

durability of jumpers. The QMA coupling mechanism creates<br />

a 360-degree butt joint that is maintained even with rotation,<br />

resulting in low <strong>RF</strong> leakage. Because QMA’s are internally<br />

identical to SMA’s, they offer low loss <strong>RF</strong> performance from<br />

DC to 6 GHz, but can be used up to 18 GHz. They offer the high power handling capability of<br />

the SMA with the ability to be used in a denser environment. This is one of the reasons we are<br />

seeing increased usage of this 50-ohm interface in the Wi-Fi device arena.<br />

REFERENCE<br />

FME<br />

FME, or “Euro-Nipple”, connectors originated in Europe and<br />

are used most prominently in antenna couplings. They have<br />

50 ohm impedance and operate in the frequency range of<br />

DC to 200 MHz. They mate with M8XP .75 threads and the<br />

female has the distinctive “nipple” appearance.<br />

7610 Miramar Road, San Diego, CA 92126 • (858) 549-6340 • (800) 233-1728<br />

fax: (858) 549-6345 • email: rfi@rfindustries.com • web: www.rfindustries.com<br />

Revised 7-27-2013<br />

182

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